The diagram shows a circular wire loop of radius R carrying current I. What is the magnitude of the magnetic field, B, at the center of the loop?
Question 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 />
1.0
2.0I/4R
3.0I/2R
4.0I/4R
5.0I/2R
6.None of the above."